新型逆作法梁板施工悬挂支撑体系研究与应用

结合天津市某逆作施工项目实例,设计了一种新型逆作法梁板施工悬挂支撑体系,此支撑体系悬挂在地下室顶板上,每层结构施工完成且下步土方开挖至要求标高后,可直接将此支撑体系下降至下层标高循环使用,省去了模板架料反复搭拆、倒运过程,加快了施工速度,同时也可有效保证结构施工质量,对类似地下逆作施工具有借鉴意义。     

当前电视节目发展的四个误区研究

新媒体时代传统电视媒体面临着诸多发展困境,有人甚至提出了电视消亡论的危机预言:但与此同时,社交电视、媒介融合、节目创新等这些被视为新媒介格局下电视媒体未来发展方向的词,又日益成为学界和业界研究和讨论的热点结合当前电视节目发展的现状,文章从创新理念、用户体验、社交互动、价值取向四个方面论述了当前电视节目发展的四个误区,为电视节目的创新发展提供借鉴意义。     

广告设计中视觉修辞的运用

广告是通过有意识、有目的地对宣传内容进行设计,进而传播出去达到一种劝消费的目的,它是大众沟通的一种形式。广告既帮助大众了解最新产品信息,同时也为广告方获得大批的消费者资源,因此,它是一种双赢的活动。视觉修辞在广告中发挥着越来越重要的作用,其修辞方式多样,而最常见的莫过于视觉夸张修辞、视觉对比修辞、视觉比喻修辞、视觉比拟修辞、视觉借代修辞五类修辞手法。     

应用GP-IB构成的运放参数测试系统

本文介绍了一种采用GP-IB构成的集成运算放大器参数自动测试系统,该系统可实现对运放九个直流参数的自动测试。文中对这些参数的测试原理、测试系统的构成及测试程序的开发进行了详细的说明。     

An electrospray ionization source for integration with microfluidics

We have demonstrated a new electrospray ionization (ESI) device incorporating a tip made from a shaped thin film, bonded to a microfluidic channel, and interfaced to a time-of-flight mass spectrometer (TOFMS). A triangular-shaped thin polymer tip was formed by lithography and etching. A microfluidic channel, 20 microm wide and 10 microm deep, was embossed in a cyclo olefin substrate using a silicon master. The triangular tip was aligned with the channel and bonded between the channel plate and a flat plate to create a microfluidic channel with a wicking tip protruding from the end. This structure aided the formation of a stable Taylor cone at the apex of the tip, forming an electrospray ionization source. This source was tested by spraying several solutions for mass spectrometric analysis. Because the components are all made by lithographic approaches with high geometrical fidelity, an integrated array system with multiple channels can be formed with the same method and ease as a single channel. We tested a multichannel system in a multiplexed manner and showed reliable operation with no significant cross contamination between closely spaced channels.     

2004年全国前30家连锁企业呈现喜人发展态势

来自商务部商业改革发展司的调查显示,2004年中国商业连锁企业经营继续保持稳步增长,全国前30家连锁企业2004年销售额为3845．6亿元,比2003年(下同)增长32．9%,店铺总数为13801个,增长23．8%。其中,直营店的销售额为3202．6亿元,同比增长30%,占销售总额的83．3%。百联集团有限公司(商业连锁部分)以676．3亿元销售额、5493家店铺的业绩,名列全国首位,销售额与店铺数分别增长22．5%和25．1%。北京国美电器有限公司、大连大商集团有限公司、苏宁电器集团、家乐福(中国地区各企业)分别以238．8亿元、230．8亿元、221．1亿元和162．4亿元的业绩排名第二至五位。     

既有建筑物地基加固与纠编实例

通过某建筑物发生不均匀沉降的纠偏实践，探讨了旋喷注浆的地基加固处理及建筑物整体纠偏的方法。其施工实践具有一定的典型性和借鉴意义。     

两种设计方法的最佳沥青含量关系探讨

对多组矿质混合料,按照沥青混合料马歇尔设计方法和Superpave设计方法分别确定最佳沥青含量.T检验表明,两种方法确定的最佳沥青含量有显著差异 .采用多元方差分析方法,研究了沥青混合料类型,矿料级配类型、沥青品种及矿料种类对两种方法确定的沥青含量差别的影响效果.结果表明,矿料级配类型是主要因素,其他因素影响不显著.根据试验结果的统计规律 ,提出马歇尔法和Superpave法确定的最佳沥青含量间的定量关系式,并对模型进行检验和实际应用.     

ABC管理法在备件管理中的应用

通过对济钢一炼钢备件管理的现状分析，提出了备件ABC管理法。实施后优化了库存结构，降低了消耗、缩短了备件周转天数，提高了企业经济效益。     

Accuracy and uncertainty of single-shot, nonresonant laser-induced thermal acoustics

We study the accuracy and uncertainty of single-shot nonresonant laser-induced thermal acoustics measurements of the speed of sound and the thermal diffusivity in unseeded atmospheric air from electrostrictive gratings as a function of the laser power settings. For low pump energies, the measured speed of sound is too low, which is due to the influence of noise on the numerical data analysis scheme. For pump energies comparable to and higher than the breakdown energy of the gas, the measured speed of sound is too high. This is an effect of leaving the acoustic limit, and instead creating finite-amplitude density perturbations. The measured thermal diffusivity is too large for high noise levels but it decreases below the predicted value for high pump energies. The pump energy where the error is minimal coincides for the speed of sound and for the thermal diffusivity measurements. The errors at this minimum are 0.03% and 1%, respectively. The uncertainties for the speed of sound and the thermal diffusivity decrease monotonically with signal intensity to 0.25% and 5%, respectively.